관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

口內全顎標準放射線寫眞 撮影時 撮影法과 필름維持法에 따른 撮影上의 失策

崔甲植,卞鍾秀,崔珣哲 大韓口腔顎顔面 放射線學會 1986 Imaging Science in Dentistry Vol.16 No.1

75명의 치과대학 4학년생들이 촬영한 300예의 구내전악표준방사선사진들을 촬영법과 필름의 유지법에 따라 필름들을 피촬영자의 엄지나 검지로 유지하고 등각법으로 촬영한 경우(Ⅰ군), 필름을 Rinn Snap-A-Ray기구로 유지하고 등각법으로 촬영한 (Ⅱ군), 필름을 Rinn XCP 기구로 유지하고 Short cone에서 평행법으로 촬영한 경우(Ⅲ군), 필름을 Rinn XCP기구로 유지하고 Long cone에서 평행법으로 촬영한 경우 (Ⅳ군)으로 분류하여 75예의 구내전악표준방사선사진으로 구성된 각 군의 재촬영의 조사하여 각 군에서 가장 많이 나타난 실책의 종류와 부위, 그리고 구내전악표준방사선사진 1회당 평균재촬영매수에 대해 아래의 결과를 얻었다. Ⅰ군 : Incorrect film placement(47.8%)와 상악 견치부(26.9%)였으며 0.89매였다. Ⅱ군 : Incorrect film placement(44.0%)와 상악대구치부(28.6%)였으며 1.12매였다. Ⅲ군 : Incorrect film placement(79.1%)와 상악대구치부(32.0%)였으며 2.05매였다. Ⅳ군 : Incorrect film placement(67.7%)와 상악대구치부(30.7%)였으며 1.69매였다. 평균재촬영매수에서는 같은 촬영법인 Ⅰ군과 Ⅱ군간에서와 Ⅲ군와 Ⅳ군간에서는 유의한 차가 나타나지 않았으나(P>0.05),등각촬영법의 군(Ⅰ+Ⅱ)보다 평행촬영법의 군(Ⅲ+Ⅳ)에서 0.86매 많았다(P<0.01). The purpose of this study was to investigate the numbers and causes of retakes in 300 complete mouth radiographic surveys made by 75 senior dental students. According to radiographic techniques and film holding methods, they were divided into 4 groups: GroupⅠ: Bisecting-angle technique with patient's fingers. GroupⅡ: Bisecting-angle technique with Rinn Snap-A-Ray device. GroupⅢ: Paralleling technique with Rinn XCP instrument(short cone) GroupⅣ: Paralleling technique with Rinn XCP instrument(long cone) The most frequent cause of retakes, the most frequent tooth area examined, of retakes and average number of retakes per complete mouth survey were evaluated. The obtained results were as follows: GroupⅠ: Incorrect film placement (47.8%), upper canine region, and 0.89. GroupⅡ: Incorrect film placement (44.0%), upper molar region, and 1.12. GroupⅢ: Incorrect film placement (79.2%), upper molar region, and 2.05. GroupⅣ: Incorrect film placement (67.7%), upper molar region, and 1.69. The average number of retakes per complete mouth survey of paralleling technique (GroupIII+IV) was higher than that of bisecting-angle technique (GroupI+II)(p<0.01). There was no differnce between GroupⅠand Group Ⅱ, and between Group Ⅲ and Group Ⅳ in the average number of reatkes per complete mouth survey(p>0.05).

特殊한 測点을 이용한 等高線작성에 있어서 非線形 補間法의 效用法

崔哲淳,崔勝弼 관동대학교 1990 關大論文集 Vol.18 No.1

Points of maximum and minimum elevations together with Points of Curvature inflection are Chosen in the field when execating levelling nets. Since these points are definite and Special in defining the slope of the ground surface, they are used in a Mathematical model for Canfouring. This method proves to more rigorous than the Usual linear interpolation. It also reduces the amount of field work required, Since only those special points which define the Ground Shape are Considered and, Accordingly, the Number of levelling points is reduced.

전악치근단방사선사진촬영, 파노라마방사선사진촬영 및 협각단층촬영시의 흡수선량

최순철,최항문 大韓口腔顎顔面 放射線學會 1999 Imaging Science in Dentistry Vol.29 No.1

Purpose: The objective of this study was to evaluate the possibility of substitution of the zonography for the full-mouth periapical radiography in aspect of radiation protection. Materials and Methods: Rando phantom and LiF TLD chips were used for dosimetry. The absorbed doses at brain, skin above the TMJ, parotid gland, bone marrow in the mandibular body, and thyroid gland during the full-mouth periapical radiography, panoramic radiography, and zonography were measured. Results: From the zonography, the absorbed doses to the brain, the skin over the TMJ, and the parotid gland were relatively high, but the absorbed doses to the bone marrow in the mandibular body and, especially, the thyroid gland were very low. Conclusion: The zonography can be an alternative to the full-mouth periapical radiography in aspect of radiation protection.(J Korean Oral Maxillofac Radiol 1999:29:253-258)

방사선조사가 설의 개방성창상치유에서 섬유아세포의 재형성에 미치는 영향에 관한 연구

최순철,박태원,유동수,이진구 大韓口腔顎顔面 放射線學會 1997 Imaging Science in Dentistry Vol.27 No.1

Radiation-impaired wound healing in animal experiments was believed to be an another logical experimental model to understand the wound healing mechanism in patients. The purpose of this study was to reveal the block point which would result in impaired healing. Twenty four rats(Sprague-Dawley strains) were divided into two groups according to the time interval between irradiation and wounding. Group I, observing the healing effect on the lst day and GroupⅡ are the healing effects on the 7th days after irradiation to the wound of the rat tongue. Experimental animals were sacrificed 3, 6, 12, and 24 hours after wounding. The specimens were examined by the light microscope and transmission electron microscope. The following results were obtained 1. Fibroblasts in both groups showed degenerative changes which were dilated mitochondria and rER, reduced microorganelle, vacuoles and little cytoplasmic process. 2. Average length between bands and quantity of the newly produced collagen fibers around fibroblasts remained unchanged against control group. 3. The severity of degenerative change of the fibroblast and impairment of wound healing including shortening of the thickness of collagen fibers were more severe in the group Ⅱ than in the group I.

전산화단층사진을 이용한 하악골 비대칭 환자의 저작근 평가

최순철,이선복,이진구,이원진,허민석,이삼선 大韓口腔顎顔面 放射線學會 2004 Imaging Science in Dentistry Vol.34 No.1

Purpose : To compare the size of the masseter and lateral pterygoid muscle between the affected and the unaffected side of the patients who have the chief complaints of the mandibular asymmetry. Materials and Methods : Twenty two patients (male: 4, female: 18, average age: 21.3 year-old) were radiographed using posterior-anterior (P-A) cephalography and computed tomography (CT). On P-A cephalography, the degree of deviation was determined by the distance from the mentum to the vertical reference line through the crista galli and the anterior nasal spine. On the scanned tracing papers of the maximum cross-sectional area of the masseter and lateral pterygoid muscle using axial CT images, the pixel number was measured. The ratio of the affected : unaffected sides were obtained. For the masseter and lateral pterygoid muscle, the relationship between the muscular volume and degree of skeletal hypoplasia was studied. Results : The half cases showed no skeletal asymmetry. The lateral pterygoid muscle of the affected side was larger significantly than unaffected side (p<0.05). However, there was no significant difference between two sides in the cases of skeletal asymmetry. There was only significant difference in the cases without skeletal asymmetry (p<0.05). Conclusions : To some extent, the slight mandibular hypoplasia could affect the growth of some masticatory muscles.

우리 나라 구강악안면방사선학 교육 현황

최순철 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Although x-ray had been used in Dental Clinic and taught as Roentgenology as a part of other lectures, the independent lecture was established at Seoul National University in 1953. The first independent Department was separated from the Department of Oral Surgery at Seoul National University in 1963. Nowadays, there are 6 national and 5 private dental schools in South Korea. Each dental school has a Department of Oral and Maxillofacial Radiology, which fulfills its role in student education and clinical service. What is specially noteworthy is that 8 of the 11 dental schools have changed or will change from the 2+4 year system to 4+4 year system (postgraduate course). The curriculum has also been or is being amended according to this change. Although the contents of courses for Oral and Maxillofacial Radiology are not much different among dental schools, the methods and structure of education are various. We have to do a systematic and comprehensive analysis of the present educational methods and structure of Oral and Maxillofacial Radiology and need to seek the new and more suitable ones based on competency.

소방 2급응급구조사의 성인 심폐소생술에 대한 숙련도 분석

최용철,이창섭,왕순주 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1

Purpose: The purpose of this study is to predict a reasonable direction to design a pertinent educational program in the future by evaluating an adult CPR (Cardiopulmonary Resuscitation) skill per-formed by EMTs engaged in fire services organization and comparing the CPR success rate of Factors as like a duty place and licensed year. Methods: We studied CPR skill by the use of a CPR manikin(Skillmeter Resusci Annie, Laerdal company). The study population consisted of 320 EMTs. Every EMT performed four cycle after investigating the manikin for 2 minutes. We regarded chest compression with 100 times in a minute as the 100% success rate. We analysed the skill of chest compression, ventilation and chest Compression times- success rate by the records printed in the CPR paper. Results: The average success rate of chest compression was 59.42 f 29.26% and ventilation 49.22 129.65%. The success rate of manual CPR was different between chest compression and ventilation. Also the success rate of chest compression times was high relatively as a 87.32+9.14%(p=0.000). For the CPR skill, ventilation was lowest as 49.22%. The factors such as duty place and licensed year did not influence the CPR success rate (p>0.001). Conclusion: We could have conclusion that CPR training should be shared more time in ventilation than in chest compression. Also we could reach to a conclusion that it is important to increase the times of CPR training for improving the accuracy of CPR and that the continuing education of CPR training frequency might be more than four times in a year.

측두하악관절내장증에서 하악과두운동과 측두하악관절조영상의 상호관계

최순철,박태원,유동수,이은숙 大韓口腔顎顔面 放射線學會 1994 Imaging Science in Dentistry Vol.24 No.2

Arthrography of the temporomandibular joint is a useful method of demonstrating the soft tissue abnormalities related to disc dysfunction. In this study, 19 asymptomatic joints, 31 joints with anterior disc displacement with reduction, 31 joints with anterior disc displacement without reduction which were classified by arthrotomography under fluoroscopy were evaluated to determine the linear measurement of anterior recess of inferior joint space and the relationship between the condylar anterior translation and the severity of the internal derangements. Their fluoroscopic images were also evaluated to describe the characteristics of condylar paths in internal derangements of the temporomandibular joints. The results were as follows; 1. The mean lengths of the anterior recess in asymptomain group, reduction group, and non-reduction group were 8.7±1.6㎜, 11.2±1.7㎜, 12.8±1.7㎜ respectively. The length of the anterior recess was increased according to the severity of the internal derangements(p<0.05). 2. Linear measurements of anterior movement of condyle on maximum mouth opening were 13.1±4.2㎜, 15.9±4.1㎜, 5.0±3.7㎜ in asymptomatic group, reduction group, and non-reduction group respectively. Compared with aymptomatic group, reduction group showed hypermobolity of the condyle and non-reduction group showed hypomobility. 3. Condyles moved beyond the crest of articular eminence in 80% of reduction group and did not reach it in 70% of non-reduction group. 4. The condyle moved mainly superiorly in reduction group(66%) and horizontally in asymptomatic group(47%). There were no cases to move superiorly in non-reduction group.

디지털카메라를 이용한 3차원 측량 기법 개발에 관한 연구

崔哲淳,崔勝弼,韓元浩,金東熙 관동대학교 1997 關大論文集 Vol.25 No.2

Photographic survey is possible that it can survey the simultaneous three-dimensional survey about so many points, therefore it is so fast and precisely. We takes a snap the objects with digital carema, and input the data to the computer from this data. We can take the three-dimensional coordinate through relative orientation, absolute orientation and have to check the merit of three-dimensional suveying. Otherwise we can get the error in one centimeter after analysis three-dimension coordinate and we can get the higher precise accuracy cause to set the camera angle of 20∼45 degrees.